Share Email Print

Proceedings Paper

Physics of high-average-power repetitively pulsed laser ablation of dielectric materials
Author(s): Manfred Hugenschmidt; Ruediger Schmitt; Jean-Pierre Moeglin; Karl Daree; Harmut Borchert
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The present paper deals with the impact of pulsed laser radiation on dielectric and semi-conducting materials. Energy trans-fer leads to fast heating and thermal ablation. Mechanical stresses additionally cause deteriorations, cracks, fragmentation or perforation. These processes develop quasi-explosively even at low energy levels. Laser effects are discussed using microsecond(s) - to ps- pulses, acting both on optically passive and active materials (optical sensors). Evaluations of plasma-sustained en-ergy transfer by the impact of ns-pulses in comparison to ps-pulses are included as well. In the medium energy range by contrast, target effects are considered which require three to four orders of magnitude higher energies per pulse and corre-spondingly higher average powers which in the burst mode are determined by the repetition rate. The repetitively pulsed CO2-laser at ISL provides energies up to 150 J, repetition rates up to100 pps, an average power of 15 kW corresponding to peak power values of 75 MW for 2 microsecond(s) pulses. This laser provides a valuable tool, particularly suited for large area out-of-band target studies. Thermo-mechanical processes, as experimentally observed are discussed and compared with results of numerical simulation. Transparency changes of optics due to ablation as quantitatively measured by the modulation trans-fer function are further included in the discussions.

Paper Details

Date Published: 13 September 2002
PDF: 12 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482077
Show Author Affiliations
Manfred Hugenschmidt, German-French Research Institute Saint-Louis (France)
Ruediger Schmitt, German-French Research Institute Saint-Louis (France)
Jean-Pierre Moeglin, German-French Research Institute Saint-Louis (France)
Karl Daree, German-French Research Institute Saint-Louis (France)
Harmut Borchert, German-French Research Institute Saint-Louis (France)

Published in SPIE Proceedings Vol. 4760:
High-Power Laser Ablation IV
Claude R. Phipps, Editor(s)

© SPIE. Terms of Use
Back to Top